Andy wrote:he's not trying to get 72~74hp out of it,

No but I'm aiming for late 60's to 70hp.

I do have experience with the 'oh so inferior' rgv engine, and between running standard heads, kit heads and re-designed centre plugged 'standard' heads. So do understand the advantages.

I'll be running 0.8mm squish, anything less I have found to be a headache, although my tz would run less but seemed a bit less eager to rev at the top.

Cheers Matt for that..

Now can anyone answer my bloody ignition query please?
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More **** two strokes than you can shake a **** stick at.